<template>
  <div v-if="!disabled" class="upload-file">
    <el-upload ref="uploadRef" v-model:file-list="fileList" :action="uploadUrl" :auto-upload="autoUpload"
      :before-upload="beforeUpload" :accept="`.${fileType.join(',.')}`" :disabled="disabled" :drag="drag"
      :http-request="httpRequest" :limit="props.limit" :multiple="props.limit > 1" :on-error="excelUploadError"
      :on-exceed="handleExceed" :on-preview="handlePreview" :on-remove="handleRemove" :on-success="handleFileSuccess"
      :show-file-list="true" class="upload-file-uploader" name="file">
      <div style="display: flex; align-items: center; gap: 16px;">
        <el-button type="primary">
          <Icon icon="ep:upload-filled" />
          选取文件
        </el-button>
        <div v-if="isShowTip" style="display: flex; gap: 10px;">
          <div style="font-size: 12px; color: #666;">
            大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
          </div>
          <div style="font-size: 12px; color: #666;">
            格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b> 的文件
          </div>
        </div>
      </div>
      <template #file="row">
        <div class="flex items-center">
          <div class="ellipsis ellipsis-1" :title="row.file.name" style="flex: 1; min-width: 0;">{{ row.file.name }}
          </div>
          <div class="ml-10px" style="white-space: nowrap;">
            <el-link :href="row.file.url" :underline="false" download target="_blank" type="primary">
              下载
            </el-link>
          </div>
          <div class="ml-10px" style="white-space: nowrap;">
            <el-button link type="danger" @click="handleRemove(row.file)"> 删除</el-button>
          </div>
        </div>
      </template>
    </el-upload>
  </div>

  <!-- 上传操作禁用时 -->
  <div v-if="disabled" class="upload-file">
    <div v-for="(file, index) in fileList" :key="index" class="flex items-center file-list-item">
      <div class="ellipsis ellipsis-1" :title="file.name" style="flex: 1; min-width: 0;">{{ file.name }}</div>
      <div class="ml-10px" style="white-space: nowrap;">
        <el-link :href="file.url" :underline="false" download target="_blank" type="primary">
          下载
        </el-link>
      </div>
    </div>
  </div>
</template>
<script lang="ts" setup>
import { propTypes } from '@/utils/propTypes'
import type { UploadInstance, UploadProps, UploadRawFile, UploadUserFile } from 'element-plus'
import { isString } from '@/utils/is'
import { useUploadTwo } from '@/components/UploadFile/src/useUpload'
import { UploadFile } from 'element-plus/es/components/upload/src/upload'
import { nextTick } from 'vue'

defineOptions({ name: 'UploadFile' })

const message = useMessage() // 消息弹窗
const emit = defineEmits(['update:modelValue', 'change'])

const props = defineProps({
  modelValue: propTypes.oneOfType<string | string[] | undefined>([String, Array<String>]).isRequired,
  fileType: propTypes.array.def(['doc', 'xls', 'ppt', 'txt', 'pdf']), // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileSize: propTypes.number.def(5), // 大小限制(MB)
  limit: propTypes.number.def(5), // 数量限制
  autoUpload: propTypes.bool.def(true), // 自动上传
  drag: propTypes.bool.def(false), // 拖拽上传
  isShowTip: propTypes.bool.def(true), // 是否显示提示
  disabled: propTypes.bool.def(false), // 是否禁用上传组件 ==> 非必传（默认为 false）
  fileNames: propTypes.object.def(() => ({})) // 文件名映射 { url: fileName }
})

// ========== 上传相关 ==========
const uploadRef = ref<UploadInstance>()
const uploadList = ref<UploadUserFile[]>([])
const fileList = ref<UploadUserFile[]>([])
const uploadNumber = ref<number>(0)

const { uploadUrl, httpRequest } = useUploadTwo()

// 文件上传之前判断
const beforeUpload: UploadProps['beforeUpload'] = (file: UploadRawFile) => {
  if (fileList.value.length >= props.limit) {
    message.error(`上传文件数量不能超过${props.limit}个!`)
    return false
  }

  // 获取文件扩展名
  const fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1).toLowerCase()

  // 验证文件扩展名
  const isValidType = props.fileType.includes(fileExtension)

  // 验证文件大小
  const isValidSize = file.size < props.fileSize * 1024 * 1024

  if (!isValidType) {
    message.error(`文件格式不正确, 请上传 ${props.fileType.join('、')} 格式的文件!`)
    return false
  }

  if (!isValidSize) {
    message.error(`文件大小不能超过 ${props.fileSize}MB!`)
    return false
  }

  message.success('正在上传文件，请稍候...')
  uploadNumber.value++
  return true
}
// 处理上传的文件发生变化
// const handleFileChange = (uploadFile: UploadFile): void => {
//   uploadRef.value.data.path = uploadFile.name
// }
// 文件上传成功
const handleFileSuccess: UploadProps['onSuccess'] = (res: any, uploadFile: any): void => {
  console.log('📤 上传成功，原始文件名:', uploadFile?.raw?.name)
  message.success('上传成功')

  // 获取原始文件名
  let originalFileName = ''
  if (uploadFile?.raw?.name) {
    originalFileName = uploadFile.raw.name
  } else if (uploadFile?.name && !uploadFile.name.includes('/')) {
    originalFileName = uploadFile.name
  } else {
    originalFileName = res.data.substring(res.data.lastIndexOf('/') + 1)
  }

  console.log('🏷️ 使用文件名:', originalFileName)

  // 删除自身
  const index = fileList.value.findIndex((item) => (item.response as any)?.data === res.data)
  if (index > -1) {
    fileList.value.splice(index, 1)
  }

  // 使用原始文件名而不是URL
  uploadList.value.push({
    name: originalFileName,
    url: res.data,
    size: res.size || uploadFile?.size
  })

  if (uploadList.value.length == uploadNumber.value) {
    fileList.value.push(...uploadList.value)
    uploadList.value = []
    uploadNumber.value = 0
    emitUpdateModelValue()
  }
}
// 文件数超出提示
const handleExceed: UploadProps['onExceed'] = (): void => {
  message.error(`上传文件数量不能超过${props.limit}个!`)
}
// 上传错误提示
const excelUploadError: UploadProps['onError'] = (): void => {
  message.error('导入数据失败，请您重新上传！')
}
// 删除上传文件
const handleRemove = (file: UploadFile) => {
  const index = fileList.value.map((f) => f.name).indexOf(file.name)
  if (index > -1) {
    fileList.value.splice(index, 1)
    emitUpdateModelValue()
  }
}
const handlePreview: UploadProps['onPreview'] = (uploadFile) => {
  console.log(uploadFile)
}

// 标记是否正在内部更新，避免watch循环触发
const isInternalUpdate = ref(false)

// 监听模型绑定值变动
watch(
  () => props.modelValue,
  (val: string | string[]) => {
    // 如果是内部更新触发的，不处理
    if (isInternalUpdate.value) {
      console.log('🔄 内部更新触发watch，跳过处理')
      return
    }

    console.log('👀 外部modelValue变化:', val)

    if (!val) {
      fileList.value = [] // fix：处理掉缓存，表单重置后上传组件的内容并没有重置
      return
    }

    fileList.value = [] // 保障数据为空

    // 获取文件名的辅助函数
    const getFileName = (url: string): string => {
      return props.fileNames[url] || url.substring(url.lastIndexOf('/') + 1)
    }

    // 情况1：字符串
    if (isString(val)) {
      fileList.value.push(
        ...val.split(',').map((url) => ({ name: getFileName(url), url }))
      )
      return
    }
    // 情况2：数组
    fileList.value.push(
      ...(val as string[]).map((url) => ({ name: getFileName(url), url }))
    )
  },
  { immediate: true, deep: true }
)
// 发送文件链接列表更新
const emitUpdateModelValue = () => {
  console.log('📤 发送modelValue更新，fileList:', fileList.value.map(f => ({ name: f.name, url: f.url })))

  // 设置内部更新标记，避免watch循环
  isInternalUpdate.value = true

  // 情况1：数组结果
  let result: string | string[] = fileList.value.map((file) => file.url!)
  // // 情况2：逗号分隔的字符串
  // if (props.limit === 1 || isString(props.modelValue)) {
  //   result = result.join(',')
  // }
  result = result.join(',')
  const files = fileList.value.map((item) => ({
    ...item,
    fileType: item.name.slice(item.name.lastIndexOf('.') + 1),
  }))

  emit('update:modelValue', result)
  emit('change', files)

  // 重置内部更新标记
  nextTick(() => {
    isInternalUpdate.value = false
  })
}
</script>
<style lang="scss" scoped>
.upload-file-uploader {
  margin-bottom: 5px;
}

:deep(.upload-file-list .el-upload-list__item) {
  position: relative;
  margin-bottom: 10px;
  line-height: 2;
  border: 1px solid #e4e7ed;
}

:deep(.el-upload-list__item-file-name) {
  max-width: 250px;
}

:deep(.upload-file-list .ele-upload-list__item-content) {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

:deep(.ele-upload-list__item-content-action .el-link) {
  margin-right: 10px;
}

.file-list-item {
  border: 1px dashed var(--el-border-color-darker);
  border-radius: 8px;
  padding: 8px 12px;
}

/* 确保文件列表布局正确 */
:deep(.el-upload-list__item) {
  display: flex !important;
  align-items: center;
  justify-content: space-between;
}

/* 确保按钮文字不被截断 */
.ml-10px {
  flex-shrink: 0;
}
</style>
